<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 对象的键要是变量，必须放在中括号里面
        let id = 4;
        const obj = {
            ["id"+id]:id,
            name:"张三",
            age:10
        } 

      
        console.log(obj["id"+id]);

    </script>
</body>
</html>